If you see Error 3194, Error 17, or 'This device isn't eligible for the requested build' in iTunes

If iTunes can’t communicate with Apple's software update server, you might see one of these messages.

Error 17

Error 1639

Errors 3000-3020

Error 3194

Errors 3100-3999

This device isn't eligible for the requested build

If you see one of these messages and need help updating or restoring your iOS device, install the latest version of iTunes and try to update or restore again. If you still can't update or restore, follow the steps below.

Address TCP/IP filtering, firewall, or security software

If you have TCP/IP filtering, firewall, or security software installed on your computer, try these steps.

Restore or update from another computer

Try to restore or update on another computer with a different Internet connection. This helps to make sure there aren't issues with your computer that might stop iTunes from communicating with the update server.

Errors 1639, 3000-3020, and 3100-3999 (with the exception of 3194) are sometimes caused by your network settings. If your computer uses a managed network, refer to your network administrator. Proxies, firewalls, and other network security measures can cause these errors. If necessary, find a different network connection to restore the device. For example, if you're restoring at work, try to restore at home or on a friend's computer and network.

Check your hosts file

After you update iTunes to the latest version, check the hosts file to make sure your computer can contact the update server.

Windows

If you’re using a Windows computer, follow the steps from the Microsoft support site. Resetting the hosts file affects software services that rely on hosts file redirects. If you're using Windows on a business computer, consult your IT department to be sure applications work correctly after you reset your hosts file.

Mac

If you're using a Mac, follow these steps:

1. In the Finder, choose Applications > Utilities.

2. Open Terminal.

3. Type this command and press Return:

sudo nano /private/etc/hosts

4. Enter the password you use to sign in to your computer and press Return. You won't see text appear in the Terminal window when you type your password.

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